<i>Design and Application of Dynamic Detection Platform with Microstructure Visual Observation Function for Micro-mechanical Properties of Agricultural Products</i>

2020 ◽  
Author(s):  
Yifeng Hao ◽  
Yongwei Wang ◽  
Jun Wang ◽  
Qianjing Jiang
Keyword(s):  
Mechanical Properties ◽  
Visual Observation ◽  
Agricultural Products ◽  
Observation Function ◽  
Dynamic Detection ◽  
Design And Application

scholarly journals Experimental Study on Mechanical Properties of Paste Backfill with Flue-Gas Desulphurisation Gypsum under Combined Action of Dry–Wet Cycles and Chloride Erosion

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 882
Author(s):  
Sheng Wang ◽  
Feng Wang ◽  
Dawei Yin ◽  
Tianqi Jiang ◽  
Zhen Zhang
Keyword(s):  
Mechanical Properties ◽  
Flue Gas ◽  
Power Plants ◽  
Mass Measurement ◽  
Visual Observation ◽  
Chloride Salt ◽  
X Ray Diffraction ◽  
Strength Change ◽  
Paste Backfill ◽  
Reducing Costs

Flue-gas desulphurisation gypsum—a solid waste from power plants—can be used to prepare paste backfill for reducing costs. Most paste backfills are exposed to dry–wet cycles and chloride salt-rich water in mines. Therefore, the mechanical properties and damage mechanisms of paste backfill with desulphurised gypsum under the coupling action of erosion due to chloride with different concentrations and dry–wet cycles were investigated using methods such as visual observation, mass measurement, uniaxial compression, acoustic emission, Fourier-transform infrared spectroscopy, X-ray diffraction analysis, and field-emission scanning electron microscopy. With an increasing number of dry–wet cycles, the mass, elastic modulus, and strength of the paste backfill exhibited the trend of increasing first and then decreasing. The failure mechanism changed from mainly vertical fractures to the alternating development of vertical and horizontal fractures. The surface denudation effect of the specimens in a solution with a higher concentration was more severe under the same number of dry–wet cycles. In this study, the laws governing the mass change, strength change, degree of surface denudation, and failure pattern of desulphurised gypsum-filled specimens under different concentrations of chloride salt and different numbers of dry–wet cycles were derived.

scholarly journals An evaluation of the physical, dynamic and aerodynamic properties of olives

2019 ◽  
Vol 65 (No. 2) ◽  
pp. 48-55
Author(s):  
Abbas Akbarnia ◽  
Mahdi Rashvand
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Agricultural Products ◽  
Test Material ◽  
Mechanical Sensitivity ◽  
Aerodynamic Properties ◽  
Sphericity Index ◽  
The Mean ◽  
Power And Energy

The determination of the physical and mechanical properties of agricultural products has always been considered as the basis for the design and fabrication of transmission, grading, and processing equipment for agricultural products. Due to the increasing production of olives and the foreign exchange earnings from its trade, the mechanisation of harvesting and processing operations is inevitable. Therefore, the aim of this study was to evaluate the physical, dynamic and aerodynamic properties of olive species in order to design and fabricate an olive oiling machine. In this research, four species of olives, namely the Manzanilla, Kalamata, Fishemi, and Oily, were used. The physical properties of the samples were completely different. The mean dimensions of the Manzanilla species are the largest and the Oily is smallest and were the inverse in relation to the sphericity index. To determine the mechanical properties of the samples, the test material was used at a speed of 8 mm·min–1. The results showed that the maximum and minimum power and energy of rupture were allocated to the Manzanilla and Oily species, respectively. The Oily samples have the most mechanical sensitivity when compared to the other samples. The aerodynamic properties of the olive species were measured using a wind tunnel. The highest velocity and drag coefficient were assigned to the Oily sample and the lowest values were assigned to the Kalamata sample.

scholarly journals Estimating Bridge Reliability by Using Bayesian Networks

2021 ◽  
Author(s):  
Andrew B. Groeneveld ◽  
Stephanie G. Wood ◽  
Edgardo Ruiz
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Bayesian Network ◽  
Cross Section ◽  
Visual Observation ◽  
Expert Elicitation ◽  
Structural System ◽  
Concrete Girders ◽  
Bridge Reliability ◽  
Main Components

As part of an inspection, bridge inspectors assign condition ratings to the main components of a bridge’s structural system and identify any defects that they observe. Condition ratings are necessarily somewhat subjective, as they are influenced by the experience of the inspectors. In the current work, procedures were developed for making inferences on the reliability of reinforced concrete girders with defects at both the cross section and the girder level. The Bayesian network (BN) tools constructed in this work use simple structural m echanics to model the capacity of girders. By using expert elicitation, defects observed during inspection are correlated with underlying deterioration mechanisms. By linking these deterioration mechanisms with reductions in mechanical properties, inferences on the reliability of a bridge can be made based on visual observation of defects. With more development, this BN tool can be used to compare conditions of bridges relative to one another and aid in the prioritization of repairs. However, an extensive survey of bridges affected by deterioration mechanisms is needed to confidently establish valid relationships between deterioration severity and mechanical properties.

scholarly journals Algorithmic model for choosing configuration parameters for robotic gripping of agricultural products

2020 ◽  
Vol 1 (6) ◽  
pp. 78-90
Author(s):  
D.K. Wu ◽  
◽  
A.L. Ronzhin ◽  
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Agricultural Products ◽  
Physical Contact ◽  
Weight Density ◽  
Urgent Task ◽  
Labor Safety ◽  
Active Research ◽  
Algorithmic Model ◽  
Vegetables And Fruits

The solution to the problem of automating the process of collecting agricultural products based on models, algorithms and multicriteria synthesis of the configuration of robotic capture and control of its software and hardware components during physical manipulations with objects of agricultural products is discussed. Performing monotonous physically difficult operations in agricultural pro-duction leads to the risk of disorders of the musculoskeletal system of workers, therefore, the use of robotic means for physical contact and manipulation with objects in agricultural production is an urgent task that ensures a reduction in the cost of production, an increase in the quality of operations performed and the labor safety of involved specialists. The variability of the physical and geometric characteristics of the fruits and the methods of their collection does not allow the creation of univer-sal robotic grippers, therefore, active research is currently underway on the design of robotic grip-pers for manipulating the fruits of individual crops, differing in weight, density, geometry, surface roughness and other parameters. The article describes the developed conceptual model of robotic gripper control, including the description of the manipulator, gripper, sensor system and the manip-ulated object of agricultural products with various forms, physical and mechanical properties. The article analyzes the physical and mechanical properties of some vegetables and fruits, methods of cutting off the fruit, which should be taken into account when developing robotic grippers. There were discussed a four-stage technique for determining the parameters of robotic gripping, including determining the characteristics of the manipulated object; characteristics of the working environ-ment; determination of the features of the manipulator on which the gripper is planned to be in-stalled, and evaluation of the efficiency of the projected gripper according to a number of criteria. The developed algorithmic model of the choice of configuration parameters for robotic gripping of agricultural products is presented. It provides, based on the analysis of the properties of the manipu-lated object, the development of requirements for the configuration and gripping control system.

scholarly journals Analysis of mechanical properties of agricultural products for development of a multipurpose vegetable cutting machine

2016 ◽  
Vol 43 (3) ◽  
pp. 432-440
Author(s):  
Jeong Gil Park ◽  
Hyun Mo Jung ◽  
Bum Seok Kang ◽  
Seong Kyu Mun ◽  
Seung Hun Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Agricultural Products ◽  
Cutting Machine

scholarly journals Determination of the physical and mechanical properties of a potato (the Agria variety) in order to mechanise the harvesting and post-harvesting operations

2019 ◽  
Vol 65 (No. 2) ◽  
pp. 33-39 ◽  
Author(s):  
Negar Ahangarnezhad ◽  
Gholamhassan Najafi ◽  
Ahmad Jahanbakhshi
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Geometric Mean ◽  
Testing Machine ◽  
Physical And Mechanical Properties ◽  
Agricultural Products ◽  
Uniaxial Compression Test ◽  
Mean Diameter ◽  
Length Width ◽  
Mass Volume

Studying the physical and mechanical properties of agricultural products has been the subject of criticism and discussion for many years already and has attracted the attention of many researchers. The physical and mechanical properties of agriculture products are the most important parameters in the design of agricultural machinery sorting systems, transmissions, processing and packaging systems. The potato is one of the most important agricultural products as a food resource. The aim of this research is to investigate the physical properties and mechanical behaviour of the potato due to its importance and the current inadequate information about it. In this research, some of the physical and mechanical properties of the potato were measured in standard conditions. The length, width, thickness, geometric mean diameter and arithmetical diameter, sphericity, surface area, aspect ratio, mass, volume, bulk density and the  projected mean area were included in the physical properties. The mechanical properties of the potato were determined by using a universal testing machine (MRT-5; Santam, Germany) with a uniaxial compression test. Then, the mechanical properties were measured with four repetitions. The physical properties of the potato such as length, width, thickness, mass, volume and geometric mean diameter had a direct relationship, while the density had an inverse relation to the size. The result of the mechanical properties of the sample, such as vertical stress, elasticity module, deformation energy, fracture force and deformation were obtained respectively as 0.34 MPa, 3.09 MPa, 892.02 J, 8.80 N and 207.22 mm. The comparison of the potato’s real volume with the standard shapes showed that the potato’s shape is similar to an oval due to the largest determination coefficient (R<sup>2</sup> = 0.86). The results of this research can be used for the design and optimisation of the processing equipment, as well as the transporting, sorting and packing of the potato crop.

The Cushion Performance of Mycelium-Cornstraw Biofoams

2019 ◽  
Vol 13 (4) ◽  
pp. 484-489
Author(s):  
Jianfeng Zhang ◽  
Peipei He ◽  
Yichen Lin ◽  
Haixia Song ◽  
Hao Dong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sound Absorption ◽  
Treatment Process ◽  
Agricultural Products ◽  
Relative Deformation ◽  
Bonding Mechanism ◽  
Corn Straw ◽  
Polymer Foam ◽  
Absorption Properties ◽  
Material Preparation

Biofoams are considered to be one of the best alternatives to polymer foam. In many biofoams, mycelium-based biofoams are favored in the recent years for its zero pollution and renewability during the forming and after treatment process. Mycelium-wood biofoams, mycelium-cottonseed shell biofoams have been proved to have good mechanical or sound absorption properties. While, whether corn straw, as the by-product of the largest yield of agricultural products, is suitable to prepare mycelium-based biofoam has not been studied yet. Here we used Pleurotus ostreatus mycelium bonding corn straw to prepare mycelium-cornstraw biofoams, and mechanical properties as well as bonding mechanism of the mycelium-cornstraw biofoams were studied. It was discovered that inoculum quantity was an important factor on the performance of mycelium-cornstraw biofoams, and inoculum quantity of 1.8% was considered as the optimal inoculum quantity. At this inoculum quantity, when relative deformation was 10%, the compressive strength of mycelium-cornstraw biofoam was about twice that of mycelium-broadleaf sawdust biofoams reported, but the time spent on material preparation is only about their 1/3.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

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